yes, if you still want them to be effective, cycle them.
test booster work mostly by indirect means. shbg, anti aromatase, ect.
after a while, your body will increase these things to level the playing feild, making you either need a whole lot more product, or take time off to make things normal again.
please excuse my lack of detail in the answer, i've answered this question a few times over at bb dot com, and dont really understand how someone could not think about these things. it seems like a no brainer.
im sure if you googled the title of this thread, you'd actually see the same question, asked and answered on multiple forums in the past.